Metal-organic coordination polymer with mixed ligand and preparation method of metal-organic coordination polymer

The invention provides a synthetic method and structural characterization of a transition metal coordination polymer. The transition metal coordination polymer has the molecular formula of [M(L)(4PBI)(H2O)]n, wherein L is 4-(1-carboxyethyl)benzoic acid; 4PBI is 2-(pyridine-4yl)benzimidazole; M is a transition metal ion at the fourth period in the periodic table of elements. The transition metal complex is prepared in such a way that L, 4PBI and metal salts are mixed and dissolved in water according to a certain proportion, then a certain quantity of sodium hydroxide is added, the mixture is placed in a polytetrafluoroethylene tube to be sealed, the polytetrafluoroethylene tube is placed in a stainless steel reaction kettle, the reaction kettle is placed in a GZX-9030 MBE electrothermal blower, crystallization is performed for 0.1-7 days at 50-200 DEG C, the room temperature is obtained through natural cooling, granular crystals are separated, and the productivity can be 50% or above. The coordination polymer with the mixed ligand is easy to prepare, good in stability and high in crystallinity, and has a very good potential application prospect in the field of biological activity, molecular magnets, molecular luminescence and the like.